118440689 has 2 divisors, whose sum is σ = 118440690. Its totient is φ = 118440688.

The previous prime is 118440667. The next prime is 118440691. The reversal of 118440689 is 986044811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117505600 + 935089 = 10840^2 + 967^2 .

It is an emirp because it is prime and its reverse (986044811) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-118440689 is a prime.

Together with 118440691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (118440629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59220344 + 59220345.

It is an arithmetic number, because the mean of its divisors is an integer number (59220345).

Almost surely, 2^118440689 is an apocalyptic number.

It is an amenable number.

118440689 is a deficient number, since it is larger than the sum of its proper divisors (1).

118440689 is an equidigital number, since it uses as much as digits as its factorization.

118440689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 118440689 is about 10883.0459431172. The cubic root of 118440689 is about 491.0966538748.

The spelling of 118440689 in words is "one hundred eighteen million, four hundred forty thousand, six hundred eighty-nine".